[Gllug] moving system from one disc to another

[Alain Williams]

On Thu, Sep 02, 2010 at 01:02:35AM +0100, Nix wrote:
> On 31 Aug 2010, James Hawtin outgrape:
> > You can dump and restore on a live system! 
> 
> Not safely (at least, you can't safely dump a mounted filesystem). dump
> and restore access raw devices directly, and Linux's raw devices are not
> cache-coherent with the filesystem: in particular, you can have pieces
> of metadata inconsistently visible through the block device which have
> actually been completely written to the device, or vice versa. That way
> lies madness (at least it does if the filesystem is busy).

Linux doesn't have raw devices for things like disks - one of the differences with Unix.
On you only get the block device for a disk.

> Filesystem authors hate dump(8). Use something else if at all possible.

+1

-- 
Alain Williams
Linux/GNU Consultant - Mail systems, Web sites, Networking, Programmer, IT Lecturer.
+44 (0) 787 668 0256  http://www.phcomp.co.uk/
Parliament Hill Computers Ltd. Registration Information: http://www.phcomp.co.uk/contact.php
Past chairman of UKUUG: http://www.ukuug.org/
#include <std_disclaimer.h>
-- 
Gllug mailing list  -  Gllug at gllug.org.uk
http://lists.gllug.org.uk/mailman/listinfo/gllug